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Dishwasher Not Draining: The Fix Is Usually Free

Standing water in the dishwasher panics owners, but the most common causes — filter, air gap, drain loop — cost nothing to fix yourself.

Don’t book the call yet

"Standing water in the bottom" is among the most common dishwasher threads online, and the top-voted answer is almost always the same: clean the filter. Most owners don’t know modern dishwashers have a removable filter — twist it out of the tub floor, rinse the sludge, reseat it.

The free checklist

1) Filter (tub floor). 2) Air gap — the chrome cylinder by the faucet; pop the cap and clear it. 3) Drain hose high-loop under the sink — if it sags, water back-flows. 4) Garbage disposal knockout — if the dishwasher was installed with a new disposal and never drained right, the knockout plug was likely never punched out. All four cost $0.

When it’s a real repair

If the checklist fails, you’re looking at a drain pump ($150–$350 installed) or, less often, a control fault. Both are economical against a 9-year average dishwasher lifespan — a 4-year-old machine with a $200 pump quote is a clear repair.

Gritty dishes are the same system

Dirty water recirculating through a clogged filter is also the cause of gritty or filmy dishes — so the free fix above frequently solves two complaints at once.

Frequently Asked Questions

  1. Why is there standing water in my dishwasher? Usually a clogged filter, blocked air gap, sagging drain hose, or an unpunched disposal knockout — all free DIY fixes before you pay for a service call.
  2. How much does a dishwasher drain pump cost? About $150–$350 installed — a sound repair on any dishwasher under 6–7 years old.

Sources

  1. r/Appliances (owner discussions)
  2. r/appliancerepair (community of working technicians)
  3. First American — Appliance & Home System Lifespans (NAHB data)

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